Locking-latch



(ModeL) J. H. BARNES.

v LOCKING LATCH- "N0. 244.842". Patented July 26,1881;

. Q in/34 7/71 8171;

u. PETERS. mamm l-mm. Washington. D c.

" UNITED STATES PATENT OFFICE.

JOHN H. BARNES, OF NEW HAVEN, CONNECTICUT.

LOCKING- LATCH.

SPECIFICATION forming areor Letters Patent No. 244,842, dated July 26,1881.

. Application filed April 23, 1881. (ModeL) To all whom "it may concern:i

Be it known that I, JOHN H. BARNES, of New Haven, in the county of NewHaven and State of Connecticut, have invented new Improvements inCylinder-Locks 5 and I do hereby declare the following, when taken inconnection with the accompanying drawings and the" letters of referencemarked thereon, to be a full, clear, and exact description of the same,and which said drawings constitute part of this specification, andrepresent, in

Figure l, a side'view in partial longitudinal section; Figs. 2'and 3,interior views; Fig. 4, outside .end view of the 'tube; Fig. 5, the key.

My invention relates to that class of cylinder-locks in which the key isconcentric with the cylinder-that is to say, its central longitudinalline is the axial line of the cylinder, so that the key extendsequidistant each side of the axis of the cylinder.

The object of the invention is, principally, to construct the outer endof the tube in the form of a guard to engage a notch in one side of thekey; and the invention consists in the construction, as hereinafterdescribed,and par- 1 ticularly recited in the claims.

therewith.

Diametrically across. the cylinder is the keyhole a,'(see Fig. 4,) andover the outer end of the cylinder a flange, b, on the tube projects soas to partially cover the cylinder. In this flange, at one side, as atd, a notch is cut corresponding to the key-hole at that side. On theopposite side a notch, e, is cut in the flange, extending to the rightand left from the keyhole the distance required to turn the key, andforming stopsfat the left and h atthe right, against which the key maystrike in turning, and arrest the further turningof the key or cylinder.

The key D (see Fig. 5) is constructed with a notch, i, on the sidecorresponding to the notch din the flange, and so that when the key isintroduced it will pass through the notch (1 into the key-hole until thenotch '6 of the key comes in line with the flange 12. Then the key thelatch or look is not required.

ders f or h.

Another advantage of the construction is the greater number of changeswhich are permitted by slight variations of the keys-as, for instance,the same bit B, (see Fig. 5,) if the notch t be made upon the oppositeside, and a 65 corresponding change of tumblers, makes an essentiallydifferent bit, but without changing its shape. i

As represented in the drawings, this invention is applied to anight-latch, which is one of the principal uses for this class of locksthat is to say, locks in which the nose of the bolt is beveled so as tobe forced inward by the closing of the door, or be drawn inward by thekey, and then automatically thrown by a spring, and sometimes calledspring latches or looks. In this class of looks it is necessary that anarrangement should be made upon the side opposite the key-hole to lockthe bolt, either in its thrown condition, so as to prevent its beingacted upon by the key, or to hold the bolt in its drawn condition whenTo this end a cam, E, is arranged upon a spindle, n, operated by a knob,F, and lying between the arms or near an arm, L, of the bolt P, and inthe case of the lock is a single stud, m, in such relative position tothe cam that whenturned down, as in Fig. 2, a shoulder, r, of the camwill strike the said stud, or when turned up, 0 as in- Fig. 3, ashoulder, s, on the cam will strike the same stud m, the single studserving as a stop for the cam in turning it in either direction.

That side of the arm adjacent to the cam is 9 5 constructed with twocavities, t and to. When the cam is turned down, as in Fig. 2, and inwhich position it is held against the stud m by a spring, It, the boltwill slide freely out and in; but when the bolt is drawn, as in Fig. 3,if the cam then be turned up, it will enter the notch w and prevent itsbeing thrown forward; or, when the bolt is thrown as in Fig. 2, if thecam then be turned up it will enter the notch t and hold the bolt inthat condition. By this construction the cam E may be cut from thinsheet metal.

The arrangement of the single stop or stud on in the case opposite thespring R which bears upon the cam, and avoiding the second stop, whichis usually on the opposite side, or the same side as the spring, enablesme to use the very thin cam described, because the stop and spring arein the same plane relatively to the cam, and not the spring above and soas to work over one of the stops, as in the usual construction.

I am aware that it is not new to arrange a cam which may be turned intothe same position to hold the bolt either drawn or thrown, and thereforedo not broadly claim such construction but I am not aware that acam hasbeen arranged for this purpose in such manner that a single stud servesto stop the cam in either of its two positions, two studs havingheretofore been necessary, one as a stop in one direction, and the otheras a stop in the other direction.

I do not wish to be understood as broadly claiming a device to arrestthe rotation of the cylinder or key-guide at apredetermined point, assuch, I am aware, is not new.

I am also aware that the application of Woolaston and Priddy, No.20,222, shows a latch substantially like the latch in this application;but I make no claim to anything shown in the said application, except asrecited in the claims hereinafter.

I claim 1. In a cylinder lock 01' latch, the tumblercylinder arrangedwithin the tube of the lock, and provided with a key-hole the centralline of which is the axis of the cylinder, the tube constructed with aflange at its outer end projecting inward over the cylinder, with anotch, d, in one side of the flange corresponding to the key-hole whenin its normal position, and a larger notch upon the opposite side,combined with a key to enter the said cylinder through the two notchesin the flange of the tube, with a notch, i, in one edge to engage withthe flange at the notch d, while the opposite edge turns free in thenotch in the flange in the opposite side, and without engagement withthe flange, substantially as described.

2. In a spring-latch, the combination of the bolt constructed with notchor notches t w, the cam E, arranged to engage either of said notches, asingle stud, in, against which corresponding shoulders, s 1', on thesaid cam will strike in either of its positions of engagement ordisengagement with the said notches on the bolt, and a spring arrangedto operate upon said cam, substantially as described.

JOHN H. BARNES.

Witnesses JOHN E. EARLE, L. I). Romans.

